TL;DR
Microsoft Teams is the best alternative in this category for most small businesses in 2026. Here is how the top options compare on features, pricing, and real-world fit.
| Quick Pick | Tool | Best For | Starting Price |
|---|---|---|---|
| Best Overall | Microsoft Teams | Teams already on Microsoft 365 wanting messaging bundled at no extra cost | Free / included with M365 |
| Best Value | Discord | Communities and remote teams wanting voice channels and free unlimited history | Free / from $9.99/mo for Nitro |
| Best for Teams | Google Chat | Teams already on Google Workspace wanting native integration | Included with Google Workspace from $7/user/mo |
| Best Free Option | Mattermost | Teams needing self-hosted Slack alternative with full data control | Free self-hosted / from $10/user/mo |
ARTICLE
Choosing the right alternative depends on your specific use case, team size, and budget. Here is the complete breakdown of the leading options compared head to head.
Best overall: Microsoft Teams
Comparison Table
| Tool | Best For | Pricing | Rating |
|---|---|---|---|
| Microsoft Teams | Teams already on Microsoft 365 wanting messaging bundled at no extra cost | Free / included with M365 | 4.5 |
| Discord | Communities and remote teams wanting voice channels and free unlimited history | Free / from $9.99/mo for Nitro | 4.5 |
| Google Chat | Teams already on Google Workspace wanting native integration | Included with Google Workspace from $7/user/mo | 4.4 |
| Mattermost | Teams needing self-hosted Slack alternative with full data control | Free self-hosted / from $10/user/mo | 4.4 |
| Twist | Remote teams wanting async-first communication without notification overload | Free / from $6/user/mo | 4.4 |
| Rocket.Chat | Open-source self-hosted alternative for teams prioritizing privacy | Free self-hosted / from $4/user/mo | 4.3 |
| Zulip | Engineering teams needing threaded conversations and powerful organization | Free / from $6.67/user/mo | 4.5 |
How we score
Each tool is scored out of 10 across four weighted criteria, based on hands-on testing and public pricing pages.
Microsoft Teams
Microsoft Teams is a strong choice for teams whose primary need is teams already on microsoft 365 wanting messaging bundled at no extra cost.
Best for: Teams already on Microsoft 365 wanting messaging bundled at no extra cost.
Pricing: Free / included with M365.
Discord
Discord is a strong choice for teams whose primary need is communities and remote teams wanting voice channels and free unlimited history.
Best for: Communities and remote teams wanting voice channels and free unlimited history.
Pricing: Free / from $9.99/mo for Nitro.
Google Chat
Google Chat is a strong choice for teams whose primary need is teams already on google workspace wanting native integration.
Best for: Teams already on Google Workspace wanting native integration.
Pricing: Included with Google Workspace from $7/user/mo.
Mattermost
Mattermost is a strong choice for teams whose primary need is teams needing self-hosted slack alternative with full data control.
Best for: Teams needing self-hosted Slack alternative with full data control.
Pricing: Free self-hosted / from $10/user/mo.
Twist
Twist is a strong choice for teams whose primary need is remote teams wanting async-first communication without notification overload.
Best for: Remote teams wanting async-first communication without notification overload.
Pricing: Free / from $6/user/mo.
Rocket.Chat
Rocket.Chat is a strong choice for teams whose primary need is open-source self-hosted alternative for teams prioritizing privacy.
Best for: Open-source self-hosted alternative for teams prioritizing privacy.
Pricing: Free self-hosted / from $4/user/mo.
Zulip
Zulip is a strong choice for teams whose primary need is engineering teams needing threaded conversations and powerful organization.
Best for: Engineering teams needing threaded conversations and powerful organization.
Pricing: Free / from $6.67/user/mo.
FAQ
Why are small teams leaving Slack in 2026?
Slack Pro now costs $8.75 per user per month and the free tier limits message history to 90 days, which forces small teams to upgrade just to access old conversations. Many alternatives offer unlimited history on free or significantly cheaper paid tiers. Microsoft Teams is free with any Microsoft 365 subscription, Discord offers unlimited free history, and Mattermost can be self-hosted for free.
Is Microsoft Teams really free?
Microsoft Teams is included at no additional cost with any Microsoft 365 Business subscription starting at $6 per user per month, which also includes Word, Excel, Outlook, and OneDrive. There is also a standalone Teams free tier with limited features. For businesses already paying for Microsoft 365, Teams effectively costs nothing additional and offers Slack-comparable functionality.
Can I self-host my own Slack alternative?
Yes. Mattermost and Rocket.Chat are open-source Slack alternatives that can be self-hosted at no software cost beyond your server infrastructure. This gives teams full data ownership and unlimited usage, with the tradeoff that someone on your team needs to manage server administration and updates. For teams with technical capacity and privacy requirements, this is the cheapest long-term option.
Conclusion
Microsoft Teams is the best Slack alternative for most small businesses in 2026 because it is effectively free if you already use Microsoft 365, and offers comparable functionality with deeper integration into Word, Excel, and Outlook. Discord is the strongest free alternative for communities and remote-first teams. Mattermost or Rocket.Chat are the right picks for teams that need full data control through self-hosting. Twist is worth evaluating specifically for distributed async teams overwhelmed by Slack's real-time notification model.
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